Marine elevator



H. BARLO W MARINE ELEVATOR Filed Jan. 24, 1927 TTORNEY INVENTOR my,flax/0W June 11, 1929.

Patented June 11, 1929.

UNITED STATES PATENT OFFICE.

HARRY BABLOW, 0F PORTMADISON, WASHINGTON, ASSIGNOR TO HARLOW MARINEELEVATOR CO. INC., OF SEATTLE, WASHINGTON, A CORPORATION OF WASHING-TON.

MARINE ELEVATOR.

Application filed January 24', 1927, Serial No. 163,289, and in CanadaIanuary 26, 1927.

My invention relates to a marine elevator. More particularly myinvention relates to a marine elevator mounted in a well in the dockcovered by a bridging section which section may be moved into openposition by means of the elevator platform.

The dock deck is often supplied with one or more railroad tracks, andoften with a track over which a travelling crane may move to facilitatethe transfer of freight to or from the vessels. The installation I ofelevators to facilitate the unloading of freight from the decks of thevessel, which decks rise and fall, of course, with the tide, makes itnecessary to interrupt the dockdeok with the elevator well. The dockdeck section which normally bridges the Well when the elevator is not inoperation must-be removed when it is desired to put the elevator intooperation. Since these dock deck bridging sections are often very heavyit is desirable to have the same rotatable by means of the elevatoritself. A special difficulty obtains in providing elevator mechanism fordocks in that the mechanism must be such as to permit the dock beingswayed or sprung out of its normal position by contacting the vesselWithout interfering with the operation of the elevator. The moving partsmust be such as to not become bound or thrown out of alignment to anextent that Will interfere with their operation.

A primary purpose of my invention is to provide a mechanism of thecharacter described which will satisfy all these conditions.

The above general objects of my invention, together with others inherentin the same, are obtained by the device illustrated in the followingdrawings, the same being preferred exemplary forms of embodiment of myinvention throughout which drawings like reference numerals indicatelike parts.

Figure 1 represents a view in elevation of an elevator platform andassociated bridging section embodying my invention.

Fig. 2 is an enlarged plan view of a detail of the same.

Fig. 3 is an end view of said detail.

In a dock deck 4 an elevator well 5 is provided having a removablebridge section 6 pivotally mounted at 7 which bridge functions to coverthe said well. A bridge seat 8 is provided on the side of the wellopposite suspended by hoisting cables 10 secured to.

each corner of said platform. Counterweight 11 assists the motor means(not shown) in raising and lowering the elevator platform. Likewisecounterweight 12 facilitat-es the rotating of the removable bridgesection 6 upon its pivotal mounting 7. A chain 13 is secured toone endof the bridge section 6, and then is reeved through sheave l4 and thencethrough sheave 15, and made fast to the bridge section 6 at 16. Thebridge platform 9 is provided with detachable chain engaging means 17which consists of a plate having a slawhead opening 18 and a knob handle19 which plate is slidably mounted under angle clips 20.

A detachable chain engaging means 21 mounted upon the dock adjacent theWell 5, is provided similarin every respect to means 17.

Having the elevator suspended at its four corners (as herein described)permits sufficient freedom for the platform to move up and down in saidelevator well and at the same time provides for engaging the chain 13 sothat said bridge section 6 may be moved up or down as may be desired bythe operating of the platform 9 by causing the chain engaging means 17carried by the platform 9 to engage the chain as hereinabove described.Jamming of the vessels against the dock at the time of mooring does notinterfere with theoperating of the de vice herein described in view ofthe fact that sufficient clearance is provided for the parts of theelevator platform and the chain 18. The structure is peculiarly adaptedto overcome all objections to swaying and displacement of the dock bycontacting the vessels at time of mooring.

The mode of operation of the device embodying my invention will appearfrom description already given, and from the drawin gs. It is manifestthat when the elevator platform 9 is moved downwardly with thedetachable claw-like chain engaging means l7'engaging the chain 13 witha link 22 of said chain disposed transversely of said opening 18, thesaid means will pull the section down into closed position so that theone end .section.

portion will rest upon the bridge seat 8. When it is desired to lift thesection the raising of the elevator platform 9 will cause the bridgingsection to swing into open position as shown in the drawing, since thechain ongaging means 17 is made fast to the chain 13. hen the rotatingof the bridge section is completed, i. e., moved to the desired openraised position, the detachable claw means 17 is moved back so that itdoes not engage the chain 18, and thereafter the elevator platform maybe moved up and down without in any wise interfering with the movablebridge The counterweight 12 operatively mounted upon one end of thebridgesection facilitates in an obvious manner the raising and loweringof the bridge section.

In order to insure the maintaining of the bridge section in openposition against unintentional closing of the same by a strong wind orotherwise, a detachable chain engaging means 21 (in all respectsidentical in construction with detachable engaging means 17) may bepreferably provided so that said chain may be locked in stationaryposition, and thereby secure the bridge in open position againstunintentional closing of the same.

I claim:

1. .A. marine elevator embodying an elevator well; an elevator platformoperatively disposed in said well; a removable bridge section coveringsaid well, said section having apivot mounting adjacent said well and aflexible member; and means carried by said platform whereby saidflexible member of said bridge section may be releasably engaged, and,when engaged said bridge section may be positively rotated by saidplatform about said pivot mounting into open and closed position,whereby said bridge section may be positively moved into open positionand allowed to continue in open position While the elevator is free tomove up and down in said well.

2. A marine elevator embodying an elevator well; an elevator platformoperatively disposed in said well; a removable bridge section coveringsaid well, and having a pivot mounting adjacent said well; sheavesmounted adjacent said well; a chain, having one end secured to one endof said bridge section, reeved through said sheaves and secured asrespects the other end to said bridge section intermediate the length ofsaid bridge section and means carried by said platform which may becaused to releasably engage said chain when desired.

3. A marine elevator embodying an elevator well; an elevator platformoperatively disposed in said well; a removable bridge section coveringsaid well, and having a pivot mounting adjacent said well; sheavesmounted adjacent saidwell; a chain, having one end secured to one end ofsaid bridge section, reeved through said sheaves and secured as respectsthe other end to said bridge section intermediate the length of saidsection; means carried by said platform which may be caused toreleasably engage said chain when desired; and locking means adjacentsaid Well, whereby said chain may be releasably engaged and said bridgesection thereby locked into open position.

In witness whereof I hereunto subscribe HARRY Benton.

